1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: namespaces kernel assocs accessors locals sequences math
4 math.order fry combinators binary-search
5 compiler.cfg.instructions
9 compiler.cfg.linearization
10 compiler.cfg.ssa.destruction
13 IN: compiler.cfg.linear-scan.live-intervals
15 TUPLE: live-range from to ;
17 C: <live-range> live-range
19 SYMBOLS: +def+ +use+ +memory+ ;
21 TUPLE: vreg-use rep n type ;
23 C: <vreg-use> vreg-use
27 reg spill-to reload-from
31 : first-use ( live-interval -- use ) uses>> first ; inline
33 : last-use ( live-interval -- use ) uses>> last ; inline
35 GENERIC: covers? ( insn# obj -- ? )
37 M: f covers? 2drop f ;
39 M: live-range covers? [ from>> ] [ to>> ] bi between? ;
41 M: live-interval covers? ( insn# live-interval -- ? )
46 [ drop ] [ [ from>> <=> ] with search nip ] 2bi
50 : add-new-range ( from to live-interval -- )
51 [ <live-range> ] dip ranges>> push ;
53 : shorten-range ( n live-interval -- )
55 [ dupd add-new-range ] [ ranges>> last (>>from) ] if ;
57 : extend-range ( from to live-range -- )
63 : extend-range? ( to live-interval -- ? )
64 ranges>> [ drop f ] [ last from>> >= ] if-empty ;
66 : add-range ( from to live-interval -- )
68 [ extend-range ] [ add-new-range ] if ;
70 :: add-use ( rep n type live-interval -- )
73 live-interval uses>> push
76 : <live-interval> ( vreg reg-class -- live-interval )
83 : block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
85 : block-to ( bb -- n ) instructions>> last insn#>> ;
89 ! Mapping from vreg to live-interval
90 SYMBOL: live-intervals
92 : live-interval ( vreg -- live-interval )
93 leader live-intervals get
94 [ dup rep-of reg-class-of <live-interval> ] cache ;
96 GENERIC: compute-live-intervals* ( insn -- )
98 M: insn compute-live-intervals* drop ;
100 :: record-def ( vreg n type -- )
102 vreg live-interval :> live-interval
104 n live-interval shorten-range
105 rep n type live-interval add-use ;
107 :: record-use ( vreg n type -- )
109 vreg live-interval :> live-interval
111 from get n live-interval add-range
112 rep n type live-interval add-use ;
114 :: record-temp ( vreg n -- )
116 vreg live-interval :> live-interval
118 n n live-interval add-range
119 rep n +def+ live-interval add-use ;
121 M:: vreg-insn compute-live-intervals* ( insn -- )
124 insn defs-vreg [ n +def+ record-def ] when*
125 insn uses-vregs [ n +use+ record-use ] each
126 insn temp-vregs [ n record-temp ] each ;
128 M:: clobber-insn compute-live-intervals* ( insn -- )
131 insn defs-vreg [ n +use+ record-def ] when*
132 insn uses-vregs [ n +memory+ record-use ] each
133 insn temp-vregs [ n record-temp ] each ;
135 : handle-live-out ( bb -- )
136 live-out dup assoc-empty? [ drop ] [
137 [ from get to get ] dip keys
138 [ live-interval add-range ] with with each
141 ! A location where all registers have to be spilled
142 TUPLE: sync-point n ;
144 C: <sync-point> sync-point
146 ! Sequence of sync points
149 GENERIC: compute-sync-points* ( insn -- )
151 M: clobber-insn compute-sync-points*
152 insn#>> <sync-point> sync-points get push ;
154 M: insn compute-sync-points* drop ;
156 : compute-live-intervals-step ( bb -- )
158 [ block-from from set ]
162 instructions>> <reversed> [
163 [ compute-live-intervals* ]
164 [ compute-sync-points* ]
170 : init-live-intervals ( -- )
171 H{ } clone live-intervals set
172 V{ } clone sync-points set ;
174 : compute-start/end ( live-interval -- )
175 dup ranges>> [ first from>> ] [ last to>> ] bi
176 [ >>start ] [ >>end ] bi* drop ;
178 ERROR: bad-live-interval live-interval ;
180 : check-start ( live-interval -- )
181 dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
183 : finish-live-intervals ( live-intervals -- seq )
184 ! Since live intervals are computed in a backward order, we have
185 ! to reverse some sequences, and compute the start and end.
188 [ ranges>> reverse! drop ]
189 [ uses>> reverse! drop ]
190 [ compute-start/end ]
195 : compute-live-intervals ( cfg -- live-intervals sync-points )
197 linearization-order <reversed> [ compute-live-intervals-step ] each
198 live-intervals get finish-live-intervals
201 : relevant-ranges ( interval1 interval2 -- ranges1 ranges2 )
202 [ [ ranges>> ] bi@ ] [ nip start>> ] 2bi '[ to>> _ >= ] filter ;
204 : intersect-live-range ( range1 range2 -- n/f )
205 2dup [ from>> ] bi@ > [ swap ] when
206 2dup [ to>> ] [ from>> ] bi* >= [ nip from>> ] [ 2drop f ] if ;
208 : intersect-live-ranges ( ranges1 ranges2 -- n )
210 { [ over empty? ] [ 2drop f ] }
211 { [ dup empty? ] [ 2drop f ] }
213 2dup [ first ] bi@ intersect-live-range dup [ 2nip ] [
215 2dup [ first from>> ] bi@ <
216 [ [ rest-slice ] dip ] [ rest-slice ] if
217 intersect-live-ranges
222 : intervals-intersect? ( interval1 interval2 -- ? )
223 relevant-ranges intersect-live-ranges >boolean ; inline